The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
Apr. 29, 1993
Hua Q Tserng, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
In one form of the invention, an integrated circuit for providing low-noise and high-power microwave operation is disclosed comprising: a) a material structure formed during a single epitaxial growth cycle, said structure comprising: i) a substrate 10; ii) a donor layer 16 above the substrate; iii) a first wide bandgap buffer layer 18 above the donor layer; iv) an undoped first channel layer 19 above the first wide bandgap layer; v) a second channel layer 24 above the first channel layer; and vi) a second wide bandgap layer 26 above the second channel layer; b) a first device 80 fabricated of the material structure comprising: i) a first source contact 50 to said first channel layer; ii) a first drain contact 54 to said first channel layer; and iii) a first gate contact 38 above the first channel layer; and c) a second device 82 fabricated of the material structure comprising: i) a second source contact 52 to said second channel layer; ii) a second drain contact 56 to said second channel layer; and iii) a second gate 46 contacting the second wide band-gap layer.